To build a solar power system, installation of electrical components must be calculated eg current, voltage, power, and load requirements. Below is an example of the power consumption from solar power.

Power	Type of Load	Examples of usage
uW	Complex electronic devices with small power	calculator,pocket computers, watches
mW	Type A : Equipment that is rarely used	Transmitter and receiver with a small capacity, LED Viewer
	Type B : Medium-power equipment, but rarely operated	alarm systems, radio pocket, children's toys, small battery charger and hand tools.
W	Type A : Medium-power equipment	Telecommunications equipment, water pumps, household appliances: lights, TV, fan, refrigerator and a store of goods
	Type B : Equipment with power requirements up to KW but rarely operated	Transmitter, housewares, lighting systems, water pumps.
kW	Central electric networks with large energy needs	farming tools, household appliances, rural electrification and water pumping installations.

By knowing the limits of power generated, solar power plant can be designed from the needs of power.For more complex systems that need to be considered is the problem of efficiency.